1、 International Telecommunication Union ITU-T H.225.0TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Transmission multiplexing and synchronization Call signalling protocols and media stream packeti
2、zation for packet-based multimedia communication systems Amendment 1: Use of the Facility message to enable call transfer Recommendation ITU-T H.225.0 (2009) Amendment 1 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRU
3、CTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229Systems aspects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.
4、349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, def
5、initions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications
6、 and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629
7、 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia appl
8、ication frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.225.0 (2009)/Amd.1 (03/2013) i Recommendation ITU-T H.225.0 Call signalling protocols and media stream pac
9、ketization for packet-based multimedia communication systems Amendment 1 Use of the Facility message to enable call transfer Summary Amendment 1 to Recommendation ITU-T H.225.0 formalizes the widely implemented call transfer mechanism outlined in Recommendation ITU-T H.323 that relies upon the Facil
10、ity message with the reason set to “callForwarded“. History Edition Recommendation Approval Study Group 1.0 ITU-T H.225.0 1996-11-11 16 2.0 ITU-T H.225.0 1998-02-06 16 2.1 ITU-T H.225.0 Annex I 1998-09-25 16 2.2 ITU-T H.225.0 Annex G 1999-05-27 16 3.0 ITU-T H.225.0 1999-09-30 16 4.0 ITU-T H.225.0 20
11、00-11-17 16 4.1 ITU-T H.225.0 (2000) Amd. 1 2002-11-29 16 5.0 ITU-T H.225.0 2003-07-14 16 6.0 ITU-T H.225.0 2006-05-29 16 6.1 ITU-T H.225.0 (2006) Amd. 1 2007-01-13 16 7.0 ITU-T H.225.0 v7 2009-12-14 16 7.1 ITU-T H.225.0 (2009) Amd. 1 2013-03-16 16 ii Rec. ITU-T H.225.0 (2009)/Amd.1 (03/2013) FOREWO
12、RD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying t
13、echnical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups whi
14、ch, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and
15、 IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to
16、 ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words
17、 does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position conce
18、rning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patent
19、s, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publica
20、tion may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.225.0 (2009)/Amd.1 (03/2013) 1 Recommendation ITU-T H.225.0 Call signalling protocols and media stream packetization for packet-based multimedia communication systems Amendment 1 Use of the Fac
21、ility message to enable call transfer 1) Changes to clause 7.2.2.16 Amend clause 7.2.2.16 as follows. 7.2.2.16 Facility In order to signal call redirection specific to ITU-T H.323 procedures (call forwarding, call transfer, redirecting a call to the MC, or forcing a call to be routed to the gatekeep
22、er) or in case of supplementary service signalling according to Recommendation ITU-T H.450, the User-user information element of the Facility message is used. This particular case shall be indicated by coding a Facility IE of length zero; i.e., the Facility information element shall consist of exact
23、ly 2 octets as follows: Octet No. 1 (information element identifier) shall be set to “00011100“ (“1CH) to indicate the Facility IE. Octet No. 2 (information element length) shall be set to “0“ to indicate that no further octets belonging to this information element follow. In order to indicate call
24、forwarding or call transfer, the Facility IE shall be empty and the Facility-UUIE shall indicate in the alternativeAddress or the alternativeAliasAddress the terminal to which the call is to be redirected. In this case, the facilityReason shall be set to callForwarded. Printed in Switzerland Geneva,
25、 2013 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, di
26、gital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and pr
27、otection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjectiv
28、e and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
